code: def setUp(self):
      super().setUp()
      self.frequencies = [1, 3, 5, 4, 2, 0]
      self.edges = [-3, -2, -1, 0, 1, 2]
  
file_path: holoviews/holoviews/tests/plotting/plotly/test_histogram.py
imports: import numpy
  from holoviews.element import Histogram
  from .test_plot import TestPlotlyPlot
label_desc: Use image node_id 1 for calling the TestHistogramPlot obj's underlying member method code with example usage: obj.setUp() without return types